typeof(member)

[TonyValenti]

Please allow typeof(...) to return the declared type of a member.

public interface MyInterface {
  string Foo {get; set;
}

....
var Type = typeof(MyInterface.Foo);
//Same as typeof(string)

[Joe4evr]

Would be better served if C# ever got infoof, since that's much more flexible. #infoofWeTrust

[HaloFour]

I kind of miss the Informix 4GL feature where you could declare a variable based on the type of another variable or member of a structure. Made refactoring very easy. 😄

[Richiban]

@HaloFour Typescript has that, and it's pretty great. You can pass any expression to typeof and it'll give you its static type.

const expr = { x: 4, y: 5 }

type T = typeof expr

[hez2010]

Why not decltype?

Some usage:

var x = new { X = 1 }; // <>f__AnonymousType0<<X>j__TPar>
var t = x.GetType().GetConstructor(new [] { typeof(int) });
decltype(x) y = t.Invoke(new object[] { 5 }); // <>f__AnonymousType0<<X>j__TPar>
// Since y is declared as <>f__AnonymousType0<<X>j__TPar> but not object,
// we can have intellisense in the following context,
// and we no longer need reflection to get the value of y.X
Console.WriteLine(y.X); // 5

public interface MyInterface {
    string Foo { get; set; }
}
....
decltype(MyInterface.Foo) x = "123"; // string x = "123"
var type = typeof(decltype(MyInterface.Foo)); // typeof(string)

[luizfernandonb]

Good suggestion